Question

我正在尝试显示主视图seque的detailViewController。

appdelegate.swift的相关部分：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    print("Notification: basic delegate (background fetch)")
    // If you are receiving a notification message while your app is in the background,
    // this callback will not be fired till the user taps on the notification launching the application.
    // Print message ID.
    if let messageID = userInfo[gcmMessageIDKey] {
        print("2 Message ID: \(messageID)")
        print("2 message : \(userInfo)")
        openPostDetail(userInfo: userInfo)
    }
    completionHandler(UIBackgroundFetchResult.newData)
}

func openPostDetail(userInfo: [AnyHashable: Any]) {


    let post_id = userInfo["post_id"] as? String

    print("post_id: \(post_id) ")

    let baseURL = URL(string: websiteUrl)
    //89169?_embed
    let postId = "89169"
    let url = URL(string: "wp-json/wp/v2/posts/\(postId)?_embed", relativeTo: baseURL)
    var newPost :Posts?
    URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
        guard let data = data, error == nil else { return }
        do {
            let json: NSDictionary = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! NSDictionary
            newPost = Posts(post: json)
            print("author: \(String(describing: newPost?.postAuthor))")


            let sb = UIStoryboard(name: "Main", bundle: nil)
            let rootVC = sb.instantiateViewController(withIdentifier: "mainView") as! NewsViewController
            let otherVC = sb.instantiateViewController(withIdentifier: "postDetailIdn") as! PostDetailTableViewController
            otherVC.post = newPost!

            rootVC.navigationController?.pushViewController(otherVC, animated: true)



        } catch let error as NSError {
            print(error)
        }
    }).resume()


}

` 当我点击推送通知时，我收到此错误：试图从主线程或Web线程以外的线程获取Web锁。这可能是从辅助线程调用UIKit的结果。现在崩溃......

提前谢谢

Answer 1

您需要更新主线程上的UI。

    DispatchQueue.main.async { 
        let sb = UIStoryboard(name: "Main", bundle: nil)
                    var navigationController = UIApplication.sharedApplication().keyWindow?.rootViewController as! UINavigationController
                    let otherVC = sb.instantiateViewController(withIdentifier: "postDetailIdn") as! PostDetailTableViewController
                    otherVC.post = newPost!

                    navigationController?.pushViewController(otherVC, animated: true)
}

我点击推送通知后无法打开详细的ViewController

1 个答案: